The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
All phases of road developmentâ€"from construction and use by vehicles to maintenanceâ€"affect physical and chemical soil conditions, water flow, and air and water quality, as well as plants and animals. Roads and traffic can alter wildlife habitat, cause vehicle-related mortality, impede animal migration, and disperse nonnative pest species of plants and animals. Integrating environmental considerations into all phases of transportation is an important, evolving process. The increasing awareness of environmental issues has made road development more complex and controversial. Over the past two decades, the Federal Highway Administration and state transportation agencies have increasingly recognized the importance of the effects of transportation on the natural environment. This report provides guidance on ways to reconcile the different goals of road development and environmental conservation. It identifies the ecological effects of roads that can be evaluated in the planning, design, construction, and maintenance of roads and offers several recommendations to help better understand and manage ecological impacts of paved roads.
A concise illustrated guidebook for those wishing to explore and know more about the storied gateway that made possible Alabama's development Forged through the territory of the Creek Nation by the United States federal government, the Federal Road was developed as a communication artery linking the east coast of the United States with Louisiana. Its creation amplified already tense relationships between the government, settlers, and the Creek Nation, culminating in the devastating Creek War of 1813–1814, and thereafter it became the primary avenue of immigration for thousands of Alabama settlers. Central to understanding Alabama’s territorial and early statehood years, the Federal Road was both a physical and symbolic thoroughfare that cut a swath of shattering change through the land and cultures it traversed. The road revolutionized Alabama’s expansion, altering the course of its development by playing a significant role in sparking a cataclysmic war, facilitating unprecedented American immigration, and enabling an associated radical transformation of the land itself. The first half of The Old Federal Road in Alabama: An Illustrated Guide offers a narrative history that includes brief accounts of the construction of the road, the experiences of historic travelers, and descriptions of major changes to the road over time. The authors vividly reconstruct the course of the road in detail and make use of a wealth of well-chosen illustrations. Along the way they give attention to the very terrain it traversed, bringing to life what traveling the road must have been like and illuminating its story in a way few others have ever attempted. The second half of the volume is divided into three parts—Eastern, Central, and Southern—and serves as a modern traveler’s guide to the Federal Road. This section includes driving tours and maps, highlighting historical sites and surviving portions of the old road and how to visit them.
TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
Roads matter to people. This claim is central to the work of Penny Harvey and Hannah Knox, who in this book use the example of highway building in South America to explore what large public infrastructural projects can tell us about contemporary state formation, social relations, and emerging political economies.Roads focuses on two main sites: the interoceanic highway currently under construction between Brazil and Peru, a major public/private collaboration that is being realized within new, internationally ratified regulatory standards; and a recently completed one-hundred-kilometer stretch of highway between Iquitos, the largest city in the Peruvian Amazon, and a small town called Nauta, one of the earliest colonial settlements in the Amazon. The Iquitos-Nauta highway is one of the most expensive roads per kilometer on the planet.Combining ethnographic and historical research, Harvey and Knox shed light on the work of engineers and scientists, bureaucrats and construction company officials. They describe how local populations anticipated each of the road projects, even getting deeply involved in questions of exact routing as worries arose that the road would benefit some more than others. Connectivity was a key recurring theme as people imagined the prosperity that will come by being connected to other parts of the country and with other parts of the world. Sweeping in scope and conceptually ambitious, Roads tells a story of global flows of money, goods, and people—and of attempts to stabilize inherently unstable physical and social environments.
A renowned historian and engineer explores the past, present, and future of America's crumbling infrastructure. Acclaimed engineer and historian Henry Petroski explores our core infrastructure from both historical and contemporary perspectives, explaining how essential their maintenance is to America's economic health. Petroski reveals the genesis of the many parts of America's highway system--our interstate numbering system, the centerline that divides roads, and such taken-for-granted objects as guardrails, stop signs, and traffic lights--all crucial to our national and local infrastructure. A compelling work of history, The Road Taken is also an urgent clarion call aimed at American citizens, politicians, and anyone with a vested interest in our economic well-being. Physical infrastructure in the United States is crumbling, and Petroski reveals the complex and challenging interplay between government and industry inherent in major infrastructure improvement. The road we take in the next decade toward rebuilding our aging infrastructure will in large part determine our future national prosperity.
